SuiteCRM Opencart Integration is seamless and real-time, no dependency on admin to run a Cron job to pull or push data. “Once the information is keyed in one system it will push data to other systems instantaneously”
gave this add-on stars.
Its completely free,customizable and very easy to install in any hosting server as I just need to run the installation file and they're good to go.I can upload a large categories of products also It has the extensive choices of free and paid plugins which makes it compatible with dozens of fonts, styles and templates. and has helped me in my store's interface.